Last modified on 2025/08/05
By Simon Coude

This is the data repository for the SOFIA Legacy Survey FIELDMAPS. The data for each filament is contained in
their respective named folder. Filament 6 is also known colloquially as the "Snake".

These data were originally published in the FIELDMAPS Data Release paper: https://doi.org/10.7910/DVN/NUXGJE

Lexicon: 
GCS - Galactic Coordinate System
ICRS - International Celestrial Reference System

===

Here is a detailed description of the data in each folder for any source:

****_Gal.fits - HAWC+ Polarization data cube in the GCS frame described in Coude et al. (2025)
****_Gal_Bmap.png - Preview image of the magnetic field structure in the GCS frame
****_N.fits - Herschel-derived map of hydrogen column density N(H_2) in cm^-2
****_Planck.fits - Planck Polarization data cube
****_RA.fits - HAWC+ Polarization data cube in the ICRS frame described in Coude et al. (2025)
****_RA_Bmap.png - Preview image of the magnetic field structure in the ICRS frame
****_RA_Original.fits - HAWC+ Polarization data cube produced directly by the SOFIA Redux pipeline
****_Tdust.fits - Herschel-derived map of dust temperature in K

===

For each source, an additional "Divided" folder is provided with single-extension FITS files. The python codes
used to divide the HAWC+ and Planck polarization data cubes into individual files are also provided.

Split_HAWC_Fits.ipynb - Jupyter Notebook used to divide the polarization cubesin this survey
SplitExtension.py - Python file with the general functions for dividing the polarization cubes

Each "Divided" folder contains the following files: 

****_Gal_B.fits - HAWC+ rotated polarization angle map (magnetic field direction)
****_Gal_dI.fits - HAWC+ Stokes I error map
****_Gal_dO.fits - HAWC+ polarization angle error map
****_Gal_dP.fits - HAWC+ de-biased polarization fraction error map
****_Gal_dPI.fits - HAWC+ polarized intensity error map
****_Gal_dQ.fits - HAWC+ Stokes Q error map
****_Gal_dU.fits - HAWC+ Stokes U error map
****_Gal_I.fits - HAWC+ Stokes I map
****_Gal_O.fits - HAWC+ polarization angle map (magnetic field direction)
****_Gal_P.fits - HAWC+ de-biased polarization fraction map
****_Gal_PI.fits - HAWC+ polarized intensity map
****_Gal_Q.fits - HAWC+ Stokes Q map
****_Gal_U.fits - HAWC+ Stokes U map

****_Planck_B.fits - Planck rotated polarization angle map (magnetic field direction)
****_Planck_I.fits - Planck Stokes I map
****_Planck_O.fits - Planck polarization angle map (magnetic field direction)
****_Planck_P.fits - Planck polarization fraction map
****_Planck_PI.fits - Planck polarized intensity map
****_Planck_Q.fits - Planck Stokes Q map
****_Planck_U.fits - Planck Stokes U map

===

The Python 3.10.8 environment used for this work directly utilized the following packages 
(and their related dependencies):
astropy                  5.3.4